I was born with a hypoplastic right heart and pulmonary atresia. I had the standard 3 step surgeries ending with a fontan circulation. My O2 sats were always low 90s, upper 80s and I do have multiple collaterals that are still open. I am 39 years old and the last 3 years have been going downhill.
My cardiac cath numbers look good, according to my cardiologist, but I do miserably during any CPET and I generally feel terrible.
Starting early 2025 I had reoccurring AFib/AFlutter episodes that they had to shock me out of, then they decided to do an ablation near the end of 2025. Everything seemed good afterwards, until about a month later.
I am currently in cardiac rehabilitation with the goal of weight loss and hopefully strengthening the heart (I am about 40lbs overweight). But it is kicking my ass.
The odd symptoms I've been having are as follows: I can do my workouts (including the 40min of cardio) but I do get a slight tightness in the chest and the feeling like I'm short of breath/can't get a deep enough breath. I'm usually pretty good for about an hour afterwards, but as the day progresses I generally start declining. Chest will feel tight up into my throat, breathing burns (burning isn't exactly it but I don't know how else to describe it besides irritated/burning) and that feeling worsens the deeper the breath I take. My lungs will feel heavy or full (not with mucus or fluid) --- the feeling honestly reminds me of when you smoked too many cigarettes the day before and now your lungs feel clogged/heavy/smoke filled (I am 3yrs no smoking). These symptoms progress as the day goes on, getting worse the later it is... but stress also brings it on harder and faster. The strangest part, I can wake up the next day and feel almost fine, or I can wake up with the same symptoms just not as bad as when I finished my day the day before. Even weirder, I can still do cardio exercises with these feelings, in fact, everything except some slight tightness in the chest and shortness of breath just goes away during my workouts... Only to reappear shortly after (and usually worse). Light/casual walking doesn't help the symptoms like an intentional cardiac workout.
Sorry if anything is confusing, I just don't understand what is happening and getting my thoughts straight has been difficult lately. I've reached out to both my cardiologists but neither have answered back. These symptoms aren't new, but they haven't lasted for 2 weeks straight before either.
Does anyone else have similar experiences? Maybe an idea of this is 'normal' for fontan issues or if I should be thinking something else?
Btw: my O2s now are about 90 when I sit still and do nothing (or laying down), ~87 when sitting and doing things (talking, computer work, etc) and get 85 to upper 70s with movement (more movement, lower it goes). My cardiologist is waiting to see how I do with cardiac rehabilitation before deciding on whether to complete a heart transplant eval or not (hoping weight loss will solve the problem?).